Description

NOTE: The lower axis is offset .7mm I am not sure if this is specific to my mill or not. If you find that it doesn't fit well let me know and I will upload a neutral version (or if you need a specific offset).

Recent Comments

Hi, I want to convert my KT70 for semi-automatic PCB drilling. I like your design very much. IMHO it is far more sophisticated and rigid than all the other NEMA motor mounts for the KT70 / MF70 I have found so far. In my KT70 there seems to be no horizontal offset in the lower axis - it is perfectly centered. Do you have a neutral version which you could upload? Would save me some refactoring of the STL. Thanks!

Hi, I want to convert my KT70 for semi-automatic PCB drilling. I like your design very much. IMHO it is far more sophisticated and rigid than all the other NEMA motor mounts for the KT70 / MF70 I have found so far. In my KT70 there seems to be no horizontal offset in the lower axis - it is perfectly centered. Do you have a neutral version which you could upload? Would save me some refactoring of the STL. Thanks!

I have modified it to accept NEMA 23 motors. There are step by step guides (plenty of images) in my blog (www.elektroquark.com) in Spanish showing how I am configuring my MF 70 with your awesome kit (work in progress).
I will use printed flexible couplers too.
Thank you very much for this kit.

***Note: You will most likely want some type of glue like gorilla glue and REALLY small self tapping/metal screws for adhering a couple of the plates together, as well as the micro switches to the appropriate places outline in goopyplastic's video.

***Note: You will most likely want some type of glue like gorilla glue and REALLY small self tapping/metal screws for adhering a couple of the plates together, as well as the micro switches to the appropriate places outline in goopyplastic's video.

A very sophisticated design - the proxxon people should hire you... :)

Two questions:
A) What material did you use for the pink prototype - resp. what do you recommend for the whole set? PLA, ABS or?
B) Why did you decide to also redesign the whole assembly that keeps the bearings and spindles in place? Reduced backlash? a defined position for the endstop switches? Or just fun doing it? ;) Some people just add motor holders ...

a) I used ABS, it shouldn't matter ABS vs. PLA as long as the motors don't get hot. b) the main reason is because the stock endplates are not very strong so you can't tighten the leadscrew nuts very much and this leaves backlash in the system, so yes it is to eliminate backlash (via tightening of the leadscrew nuts).

A) I used ABS but at the time that is what I had, PLA should work fine as well.
B) To reduce backlash primarily. The stock plates are not very strong and will deform when the leadscrew nut is tightened. That is a downside of the motor holder conversions although depending on your application the motor holders may work fine.

Thanks. Good analysis of the given construction from your side! Is there any work on FEM analysis of 3Dprinted materials done or under way already? I understand that with the multivariability of the various parameters, this is pretty complex on the first sight. On the second, it could lead to mechanically and morpholically optimized structures - assuming that the material properties are more or less reproducibkle.
Apropos - did you measure the accuracy and repeatable reproduciblity of the milling machine? You also rely on a linear characteristic of the spindles. The thread slope can vary considerably, though. Wikthout demanding too much from the simple design - a servo drive with a linear way transducer like the electromagnetic ones from Tico might be suitable to improve the setup further.